Building VTK and PThreads vs Win32 Threads

Problem

I am trying to build VTK with CUDA support using CMake. I have run into an error I'm not sure how to resolve:

CMake Error at Common/Core/CMakeLists.txt:306 (message):
  Failed to determine the thread implementation in use by the compiler.

The CMakeLists.txt in this folder at this section is attempting to determine whether to use Win32 Threads or PThreads:

Common/Core/CMakeLists.txt, Lines 288-325

vtk_module_find_package(
  PACKAGE Threads)

set(VTK_MAX_THREADS "64" CACHE STRING
  "Max number of threads vtkMultiThreader will allocate.")
mark_as_advanced(VTK_MAX_THREADS)

if (CMAKE_USE_PTHREADS_INIT AND CMAKE_USE_WIN32_THREADS_INIT)
  if (DEFINED _vtk_thread_impl_output)
    set(thread_impl_output "${_vtk_thread_impl_output}")
  else ()
    execute_process(
      COMMAND "${CMAKE_C_COMPILER}" -v
      OUTPUT_VARIABLE thread_impl_output
      ERROR_VARIABLE  thread_impl_output
      RESULT_VARIABLE result
      TIMEOUT         10)
    if (result)
      message(FATAL_ERROR
        "Failed to determine the thread implementation in use by the "
        "compiler.")
    endif ()
    string (REGEX REPLACE ".*Thread model: \((posix|win32)\).*" "\\1" thread_impl_output "${thread_impl_output}")
  endif ()
  set(_vtk_thread_impl_output "${thread_impl_output}"
    CACHE INTERNAL "thread model detection")
  if (thread_impl_output MATCHES "posix")
    set(VTK_USE_PTHREADS 1)
  elseif (thread_impl_output MATCHES "win32")
    set(VTK_USE_WIN32_THREADS 1)
  else ()
    set(VTK_USE_PTHREADS 1)
  endif ()
elseif (CMAKE_USE_PTHREADS_INIT)
  set(VTK_USE_PTHREADS 1)
elseif (CMAKE_USE_WIN32_THREADS_INIT)
  set(VTK_USE_WIN32_THREADS 1)
endif ()

I use vcpkg and installed pthread and pthreads, which is probably why it's getting confused, but is there a way to specify in CMake-GUI to use Windows threads?

Currently, my solution is to add the lines

set(CMAKE_USE_PTHREADS_INIT 0)
set(CMAKE_USE_WIN32_THREADS_INIT 1)

after

vtk_module_find_package(
  PACKAGE Threads)

in the CMakeLists.txt file.